Mechanism for crush dressing grinding wheels



Nov. 8, 1949 M. H. ARMS ET AL 2 sheets-sheet 1 Filed July 26, 1945 Nov.8, 1949 M. H. ARMS ET AL MECHANISM FOR CRUSH DRESSING GRINDING WHEELS 2Sheets-Sheet 2 Jiw 22/" fiwfwg/Mzw 4g lf ljzywiwzai M WW6 I (/7 PatentedNov. 8, 1949 MECHANISM FOR CRUSH DRESSING GRINDIN G .Merton H. Arms,Springfield, Vt, an'd'Walter "J. Augustenovich, Kansas City, Mo.,assignors to Bryant Ghucking GrinderCompany, Springfield, Vt.,a-corporation of Vermont Application July 26, 1946, Serial No. 686,4.08

7 Claims.

, This invention relates to the dressing of grind-' ingiwheelslbycrushing.

'One'o'bjectisto provide a dressing mechanism well adapted for useonxgrindingwheels'having portions .of substantially different diameters,avoiding the rapid wear of the crushing rolls caused bysubstantial'relative slippage between certainportionsof the'roll and thewheel where suc'h'diameter differences are substantial.

Atfurther objectisto provide for positive rotation of atleast'a portionof "the crushing roll which "is in contact 'with the wheel, the wheelbeing rotated bythe rotated crushing roll, or, if desired, positivelyrotated at 'a'relatively low speed.

Still "another object is to provide 'an improved mounting and drive"iorthe crushing roll with mechanism to move the prolliinto and out ofcrushing position.

Further objects and advantages will appear from adescription of certainembodiments of the invention shown inthe-accompanying draw ings in whichFigure 1 is a fragmentary plan view of the upper portion of agrinding'machine showing mechanism embodying the invention.

Figure 2is aside elevation'of thesame mechanism, a portion "of thegrinding machine frame being shown in section.

"Figure 3 is a detail sectional view on line '3-3 of Figure 1.

Figures 4 and'5 are'centralcross sectional views showing twoconstructions of crushing rolls'eith'er of which maybe "employed tocrush dress a grinding Wheel'tothe'same contour.

Referring first to Figure 2,'at l is shown portion of the frame of agrinding machine, suitably supporting for rotation at spindle 2 (seeFigure 1), to which a grinding wheel 3 is secured. Itwill be 'noted thatthis grinding wheel comprises two grinding surfaces axially separated.One of these, at 4, is a cylindrical surface, and the other, at '5, hasaconvex periphery; They may be two separate grinding wheels with 'aspacer between them rather than a single wheel, if =:desir.ed. The .meandiameter of the convex periphery portion Eris substantially smaller thanthe diameter of the-portion 4.

The frame *i also has fixed thereto, a plate 6 which is shownas arrangedin .ahorizontalplane. To this plate is secured a bracket 1, the securingmeans .comprising screws .3 .passing through a flange 9 .of the bracketand entering into threadedholes in the plate .6. Theholes through thebracket flange ,9 may be'larger than the bolts suificiently to permit ahorizontal-adjustment of the bracket I. As shown this adjustment iseffec'tedby turning a screw Ill threadedv into the bracketland'journaled in a bracket l l extending upwardly of the'p'late'fi.

"This bracket 1 has a pair of spaced bearing flanges l5 .at its rear endfor pivoting between them a support .20, theipivot being at thetrimnions l9. This support '20 carries thereon :a motor 2|, the shaft ofthis motor being connected through adriVing'beItJZZ with a'belt pulley23 fixedto a shaft '24, journaled ina casing 25 carried by the support.20.

This shaft! is'connected by a train of gearing, including the gears "26carried on the shaft 24 and algeari'l carried on a spindle V28 journaledin a casing 29 carried'iby the support20. This spindle 28, in turn,carries the crush dressing roll, indicated generally at30. "The spindle28 is shown as extendedthrough .a disk 3| forming one element of alabyrinth packing which prevents foreign material from gainingaccess tothe bearings supporting the spindle '28.

"Thesupportlil is connectedby a link pivoted at one end thereto to'apiston rod136 which enters a suitably hydraulic power cylinder 3i whereit is provided with the'usual piston (not shown).

In the position'of'the parts shownin Figure '2, the piston'36 is initsupper position, holding'the support in the position to 'presentthe crushdressing roll'30 into contact with the grinding wheel 3. Byintroducingcfluid underpressure into the upper end of the cylinders! byany suitable means (not shown), this piston, may be driven downwardly,rocking the forwardend of the supporttlllupwardly and removing thecrushing-roll from contact with thegrinding wheel.

necessarilymather small, and differences in diameter between differentportions have corresponding-1y greater relative importance than in largediameter wheels in connection with the subject matter of this invention.The feed between the crushing roll and the wheel is accomplishedfby theusual feed mechanismof the of complemental diameters to that of thewheel,

slippage must take place between some portion of the wheel and thecrushing roll, and such slippage is effective in producing a grindingaction of the grinding wheel on the roll which seriously shortens itslife.

In-Figures 4 and 5 constructions of crushing wear. ing roll is amultipart roll, comprising a body 58 having a central bore 55 shaped toengage the outer end of the spindle 28, which in this instance is shownas, tapered and of such an angle that the body portion 58 may be heldtightly for rotation by rotation of the spindle 28. This body portion 58has a crush dressing periphery 55 for a portion only of its axiallength. At another portion of its axial length, the body is of reduceddiameter to form a journal portion 55 coaxial with the crushing surface55 and coaxial with the bore 5|. Journaled on this portion 55 is a ring58, and in order to hold this ring 58 in journaled position, a retainingring 59 which overlaps a portion of the ring 58 is secured to the body55 as by screws 50. It will be noted that the outer face of the ring 58is of substantially different diameter than the outer crushing periphery550i the body, and as shown it is larger than that of the body. Thisouter face or periphery 6! of the ring 58 forms the remainder of thecrushing contour of the crushing roll. As shown it is provided with aconcavity intended to mate the convexity of the grinding portion 5 ofthe wheel 3, and of such a diameter that this crushing surface of thering 58 engages the grinding wheel at the same time that the crushingface 55 engages the portion 4 of the grinding wheel when the grindingwheel is of the size desired.

It will be noted that the crushing roll body is rotated with the spindle28, and when its surface 55 is brought into engagement with the surfaceof the portion :3 of the grinding wheel while neither is rotating andthe two are thereafter revolved together, the portion 4 of the face ofthe grinding wheel will be crush dressed, the grinding Wheel beingdriven by friction contact with the crushing face 55. This will alsotend to drive the ring 58, but as this ring is free to rotate on thebody 58, it will be driven, in turn, by its engagement with the rotatingwheel portion 5, pressing thereagainst, and at a different rate ofangular velocity than that of the body 50 by reason of the differenteffective diameters of the engaging parts on the crushing roll and thegrinding wheel. As shown, for example, the effective rate of peripheralvelocity of the grinding wheel portion 5 is less than the peripheralrate of the grinding wheel portion 5, since it is of smaller diameter.Consequently, the frictional drive rate imparted to the ring 58 by itsengagement with the grinding wheel will be slower not only because ofthe slower peripheral effective speed of the grinding wheel portion 5,but also because of the larger diameter of the effective periphery ofthe ring 58. Thus each of these parts may be driven at a speed bestsuited to its engagement with the other part, minimizing the dragbetween the wheel and the roll, and thus 4 minimizing the wear on theroll due to the cutting action of the wheel thereon.

In some cases, as when first dressing a new wheel, the ring 58 may bethe only portion of the crushing roll which is effective on the grindingwheel, and where such is the case, with the construction shown, thegrinding wheel would not be rotated by the body 50 because its surface55 would not be in engagement with the grinding wheel. In this case, inorder to cause rota tion of the grinding wheel, the ring 58 istemporarily secured to the body 58 so as to be driven thereby thus toimpart the necessary rotation to the grinding wheel for the crushdressing. The means for so doing, as shown at Figure 4, comprises a setscrew 65 threaded through a bore 66 in the body 50 and provided with aninner end 61 which may be moved into a socket 68 in the ring 58. Afriction plug 10 seated in a socket H in the. body 55 and pressed intoengagement with the set screw 55, as by a spring 12 in this socket,holds the set screw 55 in adjusted position, either into driving.engagement with the ring 58 or freeing the ring 58 for rotation relativeto the body.

In Figure 5 another form of crushing roll is illustrated for operationon a grinding wheel of the same contour as that operated upon by thecrushing roll of Figure 4. This construction comprises a body 580. whichhas a large diameter portion 51a having a crush dressing peripheryidentical with that of the, ring 58 of Figure 4. It also has a reduceddiameter portion 56a on which is journaled a ring 58a,having a periphery55a the same as the periphery 55 of the body 58 in the construction ofFigure 4. The portions of the crush surface on the journaled ring and onthe body in this construction are thus reversed from that of theconstruction of Figure 4. .The ring 58a is ,held on the journal portion56a as by a clamping ring 59a partly overlapping the ring 58a and heldin position by screws 68a. With this arrangement of crushing roll, thegrinding wheel is driven by its frictional engagement with the portion5Ia and the grinding wheel, in turn, drives the ring 55a at a higherrate of speed than is the body 58a. Here, again, if the ring portion isto accomplish the dressing action while the body portion is idle, thering will be clamped to the body portion so that the ring will be driventhereby. Means for doing this comprises the locking disc 88 which hasalaterally extending externally threaded flange 8| meshing with aninternally threaded portion 82 of the body 50a, this disk having anannular shoulder 83 adjacent its peripherywhich may engage against theend face of the ring 5811 so that when the disk is tightened it willclamp the ring 58a against the body 58a.

While as shown the crushing roll is power driven and intended to be usedwhen the wheel is free to be rotated by friction therefrom, the powercould be applied to the grinding wheel, but this would be at a muchslower rate of speed than the grinding speed. It would then be possibleto mount all the different diameter portions of the crusher roll forfreeindependent rotation, though, if desired, one might be power driven ifat a speed correctly related to that of the correspending portion of thegrinding wheel for the crushing action.

From the foregoing description of certain embodiments of this invention,it will be evident to those skilled in the art that various furthermodifications and changes might be made without departing from thespirit or scope of this invention.

We claim:

1. In combination, a rotary shaft, means for rotating said shaft, amulti-part crushing roll carried by said shaft, one part of said rollbeing supported for rotation with said shaft, another part of said rollbeing mounted coaxially with said first part for rotation relative tosaid first part, each of said parts having grinding wheel crushingperipheries, the crushing peripheries of said one and said other partbeing of substantially different eifective diameters.

2. In combination, a rotary shaft, means for rotating said shaft, amulti-part crushing roll carried by said shaft, one part of said rollbein supported for rotation with said shaft, another part of said rollbeing mounted coaxially with said first part for rotation relative tosaid first part, each of said parts having grinding wheel crushingperipheries, the crushing peripheries of said one and said other partbeing of substantially different effective diameters, and means forlocking said parts against relative rotation.

3. A crushing roll presenting a peripheral wheel crushing portion and ajournal portion coaxial with said wheel crushing portion, and a ringjournaled on said journal portion and having a wheel crushing peripheryof substantially different effective diameter than the effectivediameter of said crushing portion.

4. A crushing roll presenting a peripheral wheel crushing portion and ajournal portion coaxial with said wheel crushing portion, a ringjournaled on said journal portion and having a wheel crushing peripheryof substantially different effective diameter than the effectivediameter of said crushing portion, and means for releasably securingsaid ring to said roll against relative rotation.

5. A crush dressing roll comprising a body having a bore to receive arotating spindle and having at a portion of its axial length a wheelcrushing periphery coaxial with said bore, and another portion of itsaxial length formed as a journal 6 part, a ring journaled on saidjournal part and having at its periphery a wheel crushing portion, and aretaining ring secured to said body and overlapping said journaled ringfor retaining said journaled ring on said journal portion.

6. A crush dressing roll comprising a body having a bore to receive arotating spindle and having at a portion of its axial length a wheelcrushing periphery coaxial with said bore, and another portion of itsaxial length formed as a journal part, a ring journaled on said journalpart and having at its periphery a wheel crushing portion, a retainingring secured to said body and overlapping said journaled ring forretaining said journaled ring on said journal portion, and an elementcarried by said body and adjustable to engage or to free said journaledring for releasably securing said journaled ring against rotationrelative to said body.

7. A crush dressing roll having dressing peripheries of differenteffective diameters arranged adjacent to each other for simultaneousdressing action, said peripheries being on separate portions of saidroll free for independent coaxial rotation at different angularvelocities.

MERTON H. ARMS. WALTER. J. AUGUSTENO-VICH.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,440,338 Buswell Dec. 26, 19221,513,758 Hanson Nov. 4, 1924: 2,360,127 Hartley et al. Oct. 10, 194-1FOREIGN PATENTS Number Country Date 465,869 Great Britain May 18, 1937519,080 Great Britain Mar. 15, 1940 526,075 Great Britain Sept. 10, 1940

